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The memorial includes twin walls, transecting a "gently sloped mound anchored by a granite path that is directed toward Ground Zero.[2] Two 30-foot-high rectangular towers stretch 208 feet, 10 inches long — the exact width of the World Trade Center towers, the proportion of the walls a symbolic representation of the buildings as if they were lying on their sides.[2] The name of each of the 746 victims is etched in stainless steel in 4-inch-high letters. A granite passsage is oriented to face the site of the twin towers.[2][3] The name of the memorial is taken from the Bruce Springsteen song Empty Sky, which is about the "empty sky" where the towers once stood.[4]